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Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates
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Mesozooplankton size structure in the Canary Current System.

María Couret1, José M Landeira1, Víctor M Tuset1

  • 1Instituto de Oceanografía y Cambio Global, IOCAG, Universidad de Las Palmas de Gran Canaria, Unidad Asociada ULPGC-CSIC, Campus de Taliarte, 35214, Telde, Gran Canaria, Canary Islands, Spain.

Marine Environmental Research
|April 13, 2023
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Summary
This summary is machine-generated.

Zooplankton community structure varied with oceanographic conditions in the Canaries-African Transition Zone. Plankton size spectra and composition reveal insights into marine food web dynamics and trophic efficiency.

Keywords:
Abundance distributionCanaries-African transition zoneCommunity structureMesozooplanktonSize spectra

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Area of Science:

  • Marine Ecology
  • Zooplankton Community Dynamics
  • Oceanography

Background:

  • Plankton composition significantly impacts marine food web dynamics and carbon sequestration.
  • Understanding plankton distribution is crucial for assessing trophic transfer and ecosystem efficiency.
  • The Canaries-African Transition Zone (C-ATZ) exhibits high environmental variability, transitioning between upwelling and oligotrophic conditions.

Purpose of the Study:

  • To investigate zooplankton distribution, abundance, composition, and size spectra in the C-ATZ.
  • To characterize plankton community structure under varying oceanographic conditions throughout the annual cycle.
  • To understand the role of zooplankton in trophic transfer and ecosystem function within this transitional zone.

Main Methods:

  • Analysis of zooplankton abundance, composition, and size spectra.
  • Clustering of sampling stations based on seasonal and spatial oceanographic conditions.
  • Comparison of size spectra between day and nighttime sampling to account for diel vertical migration.

Main Results:

  • Zooplankton distribution clustered into two main seasonal groups (productive vs. stratified) and an upwelling-influenced group.
  • Steeper size-spectra slopes during daytime in the stratified season suggest a less structured community and higher trophic efficiency during the late winter bloom (LWB).
  • Cladocera, Salpidae, and Appendicularia were key taxa differentiating seasonal and spatial groups.

Conclusions:

  • Zooplankton abundance and composition effectively describe taxonomic changes within the community.
  • Plankton size spectra provide insights into ecosystem structure, trophic interactions, and size structure shifts.
  • Seasonal and diel variations significantly influence zooplankton community structure and ecosystem functioning in the C-ATZ.